Today's Message Index:
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1. 07:31 AM - Re: one-wire alternators- the subject that just won't die (Robert L. Nuckolls, III)
2. 07:42 AM - (Todd Bristol)
3. 08:41 AM - Re: Unsubscribe (Jon Molek)
4. 09:06 AM - Re: Re: Unsubscribe (Tim Andres)
5. 09:39 AM - Re: Re: Unsubscribe (Jon Molek)
6. 10:55 AM - GNS430 Microphone/Sidetone Problem (Jared Yates)
7. 03:10 PM - Re: one-wire alternators- the subject that just won't die (Charlie England)
Message 1
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Subject: | Re: one-wire alternators- the subject that just won't |
die
At 02:58 PM 7/23/2014, you wrote:
Hi Bob,
Please forgive me, but I need a refresher on why
one-wire (internally regulated) alternators are
no longer recommended for a/c; even banned from 'the Book'.
I've never 'banned' anything from the book. But in the
interest of brevity and shortest path to demonstrated
success at low risk levels, I have focused AeroElectric
efforts on a limited range of ideas and products that
embrace the best-we-know-how-to-do . . .
Far too many over-excited people have morphed my
recommendations into warnings: "DON'T DO THAT lest
you fall out of the sky an die!" I have never
worked on or read about an accident that had
root cause in failure of electrical parts to perform
as advertised . . . EVERY case I'm aware of had roots
in human failings to understand limits imposed by
poor craftsmanship or operation of those parts.
I do remember (scratch that; know from
experience) that if the B-lead contactor opens
while the alternator is under load, there can be
a 'load dump' (high voltage spike) issue that can
kill the electronics (the regulator) in the alternator. Makes sense.
Only on certain alternators that fall short of the-
best-we-know-how-to-do. Consider this excerpt from
the chapter 3 of the 'Connection
http://tinyurl.com/nchenmr
[]
But if the only way the B-lead contactor is
allowed to open is due to an overvoltage fault,
does it matter? =C2 At that point, it's a given
that the regulator is already toast, and the
entire alternator will be swapped out to fix it.
Given the very high reliability of modern
automotive alternators, and that the only time
the B-lead contactor would need to open under
load is during a true OV fault event, what's the
compelling reason to keep the 'not recommended' philosophy?
Not a 'big deal' as you have deduced. The 'problem'
is rooted in legacy cockpit protocols that do
not prohibit turning off a loaded alternator.
You can do it in any TC aircraft without risk
of damage. You can do it in any aircraft fitted
with an alternator of the quality cited in the
narrative about MPA. But unlike the cookie-cutter
conformity control offered by the TC aircraft
world, we have no way to KNOW what quality of
alternator was being offered by Van's . . .
it seems that one or more of his customers
experienced a untimely demise of his alternator
by switching it on and off with the b-lead
contactor.
I've had a couple of different career paths
involving running a soldering iron & modifying
stuff (both consumer and industrial electronics
maintenance), so I'm not 'afraid' to dig into an
alternator to modify it for external regulation.
But I'm of the 'if it ain't broke, don't fix it' school.
By all means, dig in. Photograph every step.
Show us what you found and how you dealt with
it . . . you're not 'fixing' it, you're adapting
it to higher design goals.
I'd like to be educated on what I'm overlooking
in terms of risk, failure modes (fire?), etc.
If it's reasonable to bring the one-wire
alternator (with contactor style OV
protection)back into the mix, the next question
will be about integrating a backup dynamo style
alternator without spending close to half an
Aviation Unit for the hardware. :-)
Yeah . . . but. The same project economics are in
play here as for the dummy-load conversation we had
earlier this week. The $parts$ are cheap but the
$time$ is significant. Further, there are $risks$
for not being aware of all the design subtleties.
Not risks of life, limb and airplane . . . but of
future $time$ expended to 'fix' something overlooked.
You can purchase an ND cored reman for a very reasonable
price. But check installation dimensions so that you
can use a commonly available bracket. You may need to
find a new pulley. Doing the 'mod' is straightforward
and low risk.
The PM alternator is a bit harder. You need either a pulley
on the engine and brackets to hold the alternator . . .
or the machining resources to craft a pad-friendly spline drive.
I think the SD-8 is pretty attractively priced given
the effort it would take to DIY.
Bob . . .
Message 2
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Hello Out there....=0AWhat can I do to subscribe to the List / Group?=0A-
=0ATodd Bristol=0AInteractive Entertainment DJs and Events,=0ACasino Partie
s and Game Shows.=0AMesa, Arizona=0A480-755-4200=0Awww.djs4u.com=0Awww.game
showsamerica.com=0Awww.condopenasco.com=0A=0A=0ASport Pilot...=0A=0A- -
- - - - - - - -_|_-=0A-------- Todd ___
/===\___ Bristol=0A----- \__________(- .- )___________/
-=0A---------- (*)--- \___/--- (*)
Message 3
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i wanted to unsubscribe to the email forms ,
(i'm getting to many to keep up with & then erase)
----- Original Message -----
From: Todd Bristol
To: aeroelectric-list@matronics.com
Sent: Thursday, July 24, 2014 10:40 AM
Hello Out there....
What can I do to subscribe to the List / Group?
Todd Bristol
Interactive Entertainment DJs and Events,
Casino Parties and Game Shows.
Mesa, Arizona
480-755-4200
www.djs4u.com
www.gameshowsamerica.com
www.condopenasco.com
Sport Pilot...
_|_
Todd ___ /===\___ Bristol
\__________( . )___________/
(*) \___/ (*)
Message 4
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Nobody can do this for you, log onto the Matronics site and adjust your set
tings. The link is in every email.=0A=0ATim=0A=0A=0A=0AOn Thursday, July 24
, 2014 8:54 AM, Jon Molek <acub@neo.rr.com> wrote:=0A =0A=0A=0A =0Ai wanted
to unsubscribe to the email forms =0A,=0A(i'm getting to many to keep up w
ith- & =0Athen erase) =0A----- Original Message ----- =0A>From: Todd Bris
tol =0A>To: aeroelectric-list@matronics.com =0A>Sent: Thursday, July 24, 20
14 10:40 AM=0A>=0A>=0A>Hello Out there....=0A>What can I do to subscribe
to the List / Group?=0A>-=0A>Todd Bristol=0A>Interactive Entertainment DJ
s and Events,=0A>Casino Parties and Game Shows.=0A>Mesa, Arizona=0A>480-755
-4200=0A>www.djs4u.com=0A>www.gameshowsamerica.com=0A>www.condopenasco.com
=0A>=0A>=0A>=0A>Sport Pilot...=0A>=0A>=0A>- - - - - - - -
- -_|_-=0A>-------- Todd ___ /===\___ Bristol
=0A>----- \__________(- .- )___________/-=0A>----
------ (*)--- \___/--- (*)=0A>=0A>-=0A>-=0A>hr
ef="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matr
onics.com/Navigator?AeroElectric-List=0Ahref="http://forums.matronics.com
">http://forums.matronics.com=0Ahref="http://www.matronics.com/contributi
==
Message 5
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there's no place in it I can find it says to unsubscribe
unless there's a difference site I'm not looking at,maybe you can send me th
at site and I'll do it
thank you John
Sent from my iPad
> On Jul 24, 2014, at 12:05 PM, Tim Andres <tim2542@sbcglobal.net> wrote:
>
> Nobody can do this for you, log onto the Matronics site and adjust your se
ttings. The link is in every email.
> Tim
>
>
> On Thursday, July 24, 2014 8:54 AM, Jon Molek <acub@neo.rr.com> wrote:
>
>
> i wanted to unsubscribe to the email forms ,
> (i'm getting to many to keep up with & then erase)
> ----- Original Message -----
> From: Todd Bristol
> To: aeroelectric-list@matronics.com
> Sent: Thursday, July 24, 2014 10:40 AM
>
> Hello Out there....
> What can I do to subscribe to the List / Group?
>
> Todd Bristol
> Interactive Entertainment DJs and Events,
> Casino Parties and Game Shows.
> Mesa, Arizona
> 480-755-4200
> www.djs4u.com
> www.gameshowsamerica.com
> www.condopenasco.com
>
> Sport Pilot...
>
> _|_
> Todd ___ /===\___ Bristol
> \__________( . )___________/
> (*) \___/ (*)
>
>
>
>
> href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.m
atronics.com/Navigator?AeroElectric-List
> href="http://forums.matronics.com">http://forums.matronics.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/c
> http://www.matronics.com/Navigattarget="_blank" href="http://forums.ma
tronics.com/">http://forums.matro -->
>
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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>
Message 6
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Subject: | GNS430 Microphone/Sidetone Problem |
Today when I started my flight, all seemed well. Shortly after takeoff I
tried to make a radio call, but when I held the mic key, instead of getting
the usual sidetone, I got a series of clicks. I don't recall it doing that
when I made my departing radio calls. I plugged a second headset into the
other front seat and got the same results when I pushed the other PTT. I
put the second headset back into the original side and tried again with the
same result, as to help ensure that the headset wasn't the problem. The
first headset was a Bose X through a LEMO plug (which is wired to the
adjacent two-plugs per Bose instructions), and the second was a David Clark
through the usual two plugs. I'm away from my usual shop and tools, so I
wonder if anyone might have any tips about where to focus my
troubleshooting? Has anyone encountered this type of behavior before out
of the 430 or another radio? This is a single-radio installation with a
Flightcom 403 intercom. The left and right PTT keys are consolidated in
the intercom, but with the behavior being the same on both sides, I'm
doubtful that the problem would be there.
Message 7
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Subject: | Re: one-wire alternators- the subject that just |
won't die
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